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Adding Heating Element to Aqueous Parts Washer

I would like to add a heating element to a metal parts washer for automotive use. The parts washer is a metal cabinet on legs that will carry 24 gallons of an aqueous washing solution. The washing solution works more efficiently if heated to 120 degrees Fahrenheit. This would be a 120v circuit preferably coming from a GFCI outlet. The circuitry would be similiar to a hot water heater.

My question is should the actual metal washer itself have an electrical ground fault circuit installed leading from the washer back to the ground on the receptacle or does the GFCI itself prevent risk of electrocution?